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Ludwigia alternifolia
Yellow flower whose five petals make a pretty green star pattern in the center. I think it might be a species of Lysimachia (loosestrife), but all the ones that occur in this area seem to have fringed edges to the petals. These were all pretty smooth.
Growing alongside Poplar Tree Lake at Meeman-Shelby Forest State Park.
Hey, thanks! I was definitely confused by most of them having four petals (other than, of course, the one I picked to photograph). Almost all the others I photographed that day have four.
I like that my wildflower book says they're sometimes called false loosestrife...so at least I was aiming at a decent target. :)